Cryoscopy of Amine-Polytungstates

다중텅그스텐산 아민염의 분자량 측정

  • 변종홍 (한국과학기술연구소) ;
  • 연손수 (한국과학기술연구원 무기화학연구실)
  • Published : 1974.04.30


Trioctylamine-and tricaprylylmethylammonium chloride-tungstate salts have been prepared by solvent extraction from the sodium tungstate solution of various acidities(pH = 2, 4, 6). The molecular weights of the amine-tungstate salts thus obtained could be cryoscopically measured in benzene by means of a home-built Wheatstone bridge utilizing thermistor with sensitivity of 1/$4000^{\circ}C$. The cryoscopic data along with the results of chemical analysis and infrared spectra of the salts indicate that the amine-tungstates prepared at pH = 2 and 4 are all metatungstate whereas the salt obtained at pH = 6 is an unknown form quite different from the expected paratungstate.R = 0.14. By hydrogen bonding a guanidyl nitrogen of a sulfaguanidine molecule is linked to the sulfonyl oxygens of the other molecules indirectly through two different water molecules. The role of water molecule is both a .nor and an acceptor in hydrogen-bonding formation and these hydrogen bonds are tetrahedrally o?ented. The hydrogen-bonding networks form infinite molecular layers parallel to (001) plane.



  1. Prog. Inorg. Chem. v.4 D. L. Kepert
  2. Proc. Rny. Soc. (London) v.A144 J. F. Keggin
  3. J. Korean Chem. Soc. v.17 Young Sun Uh;Hoosung Lee;Youn Soo Sohn
  4. Experimental Physical Chemistry F. Daniels;J. W. Williams;P. Bender;R. A. Alberty;C. D. Cornwell
  5. Modern Aspects of Inorganic Chemistry H. J. Emeleus;J. S. Anderson
  6. Z. anorg. Chem. v.177 F. Hoermann
  7. J. Korean Chem. Soc. v.16 Hoosung Lee;Young Sun Uh;Youn Soo Sohn
  8. J. Gen. Chem. U.S.S.R. v.8 V. I. Spitsyn;I. M. Kuleshov;I. I. Tikhomirov
  9. Zhur Fiz. Khim. v.24 V. I. Spitsyn;I. M. Kuleshov
  10. Z. Naturforschung v.20b O. Glemser;W. Holznagel;W. Holtje;E. Schwarzmann
  11. Z. anorg. Chem. v.143 J. A. M. Van Liempt